Louis hills



' (No Model'.) 2 Sheets-8heet 1.

L.HILLS.

ELEGTRHEARG LAMP.

To. 498,269. Patented May 80, 1893.

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(No Model.) 2 Sheets-Sheet 2.

L. HILLS. ELECTRIC ARC LAMP.

No. 498,269. Patented May 30, 1893.

UNITED STATES PATENT OFFICE.

LOUIS HILLS, OF NEW YORK, N. Y,

ELECTRIC-ARC LAMP.

SPECIFICATION forming part of Letters Patent No. 498,269, dated May 30, 1893,

Application filed September 2, 1891. Serial No. 404,515. (No model.)

To all whom it may concern:

Be it known that I, LOUIS HILLS, a citizen of the United States, and a resident of New York, in the county of New York and State of New York, have invented a certain new and useful Focusing Arc Lamp, of which the following is a specification.

My invention relates to the construction of focusing arc lamps, and its object is to provide a lamp in which the feeding action shall be uniform in all inclinations of the lamp when the same is employed in a search light or in other positions where the vertical angle of the light requires to be changed by. tilting the lamp.

\Vhen focusing arc lamps are constructed with the usual rack and pinion between the carbon and the feed mechanism there is a very considerable increase in the friction when the lamp is tilted and, moreover, if the weight of the carbon rods and carriers be depended upon for feeding the carbons, there will be a great difference in the power which tends to feed them in the different inclinations, and it would obviously be impossible to feed them when gravity alone is depended upon if the lamp were tilted to throw the beam vertically upward.

I aim by my invention to diminish the differences of action due to the change in friction when the lamp is tilted and also to maintain a practical uniformity in the strength of the feeding influence.

My invention consists in the particular constructions and combinations of devices hereinafter described and more particularly specified in the claims.

In the accompanying drawings:Figure 1, is a side elevation of a lamp mechanism embodying my invention. Fig. 2, is an edge view of parts which enter into the construction containing my invention.

A, indicates the usual case or frame for the lamp and B, the feeding and lifting magnet which may be shunt wound, series wound or have a combined series and shunt winding as desired.

0, G are respectively the positive and negative carbons of the lamp, the upper being secured by a proper clamp attached to a bracket which extends from a vertical rod or bar D, connected with the feed mechanism.

The lower carbon 0 is secured by a similar clamp attached to an arm extending from the lower carbon rack bar D The bar D, conneoted with the upper carbon is provided on its side with a rack which gears with a pinion D upon the same shaft with a similar pinion D which in turn gears with the rack on the bar D The object of this intermediate gear is, as well understood in the art, to produce the proper relative feed of the positive and negative carbon. Upon the opposite side of the rod D, is a rack which connects with any suitable feed mechanism mounted on and operated by means of the lever E, to which the core or armature of the electro-magnet is connected in any proper manner. The lever E, is mounted as usual in a proper frame or standard.

The construction of the feed gear or mechanism and the means for connecting the upper and lower rods which carry the carbons so that they shall feed at the proper relative rate form no particular part of my invention and need not be described further in detail. It is sufficient to say that the feed mechanism may be connected with the rod D, in any desired manner so that the rod may be held from movement when the arc is of normal length but may be released to permit it to move and bring the carbons nearer together when the consumption of the carbon requires a feed.

The bar or rod D, is according to my present invention, provided with a slot G, which extends through the same from side to side and in which work two rollers H, H adapted to bear against either edge of the slot to diminish the friction. These rollers extend through the slot from side to side and are mounted in suitable brackets I, 1 supported upon but insulated from the frame of the lamp or other suitable support. By means of these rollers the friction and tendency to binding of the mechanism or parts with which the rod D engages are diminished when the lamp is turned in a vertical plane.

I am aware that it has been before proposed to employ friction rollers for guiding the rods supporting the carbons of arc lamps, and do not therefore wish to be understood as claiming friction rollers broadly, my present invention being confined to the particular construction shown whereby the desired result is obtained in a simple and effective way by the use of but two rollers above and below.

Instead of depending entirely upon gravity due to the superior weight of the upper carbon rod D, and its attachments, as is usual in focusing lamps, I employ in connection with the said rod an actuating device which has a substantially uniform power or effect tending to feed the carbons together in all angular positions of the lamp. This device consists of a suitable chain, cord or similar device M, which is attached at one end to the rod D, near the upper end thereof, as shown, While its other end is adapted to Wind upon a drum or wheel R. The drum R, is secured to a suitable shaft mounted in suitable bearings, the pedestals of which are indicated at S. Upon the same shaft or suitably secured so as to impart movement to the drum R, is wound an actuating spring T, which is preferably a strap spring one end of which is secured to the shaft carrying the drum R, while its other end is attached to some external fixed support. WVhen the carbon rod D, is raised at the time of insertion of a new carbon, the spring is wound up and during the feeding of the carbon exerts through the cord M, a constant influence tending to feed the carbon.

The fixed or stationary end of the strap spring is preferably provided with some means whereby the strength or tension of the spring may be adjusted. For this purpose it may be attached as shown to a spring XV, which in turn connects with a proper adjusting screw and nut indicated at V. When the lamp is working in perfectly vertical position, the adjustment may be made such that the springshall exert its weaker effect. When,

however, the lamp is turned or inclined in,

vertical planes, thus bringing a somewhat greater friction to bear on the mechanism and diminishing the effect due to the gravity of the parts, the tension of the spring T, may be adjusted by means of the device V, so that there shall be a greater effect exerted through the connection M. This device should be adj usted obviously to give the increased effect to the spring T, whenever the lamp is in constant use for the purpose of directing a beam of light to different points in a vertical plane.

-What I claim as my invention is- 1. The combination in a focusing arc lamp, of a carbon supporting bar or rod supporting the upper carbon and connected to the feed mechanism, and friction rollers H, 1-1 extending through a slot in said bar, and bearing against either edge of the slot so as not only to keep the bar engaged with the feed Wheel but to prevent binding when the lamp is tilted.

2. In a focusing arc lamp, the combination substantially as described, of the slotted bar D, carrying the upper carbon, rollers 11, I1 extending through said slot and mounted in suitable brackets attached to the said rollers bearing against either edge of the slot so as not only to keep the bar engaged with the feed wheel but to prevent binding when the lamp is tilted.

3. The combination in a focusing arc lamp, of a rod or support for the upper carbon having a slot extending through it from side to side and formed at its opposite edges with two racks one engaging with the feed mechanism of the lamp, an intermediate gear between the other rack and the rod which supports the lower carbon, and rollers extending through the slotted red, as and for the purpose described.

4. The combination in a focusing arc lamp, of a rod or support for the uppercarbon formed at its opposite edges with two racks one en gaging with the feed mechanism of the lamp, and an intermediate gear between the other rack and the rod which supports the lower carbon, as and for the purpose described.

5. The combination in a focusing arc lamp, of a rod or bar supporting the carbon and connected with the feed mechanism of the lamp, an actuating cord orband M, connected at one end to said bar and atthe other wound upon a suitable drum,and a spring T, wound around the shaft and connected at one end to the drum or its shaft and at the other to a suitable support, as and for the purpose described.

6. The combination, substantially as described, in a focusing arc lamp, of a carbon carrying bar connected to the feed mechanism of the lamp and to the bar which sup ports the opposite carbon through a suitable intermediate gear, an actuatingcord or band M, attached to the carbon carrying bar or support, a drum upon which said core is wound, a spring connected at one end to the drum and tending to turn the same in a direction to cause a feed of the carbon to take place, and suitable adjusting devices connected to the opposite end of the spring whereby the efiect of the same in feeding the carbons may be adjusted to different inclinations of the lamp.

7. The combination, substantially as described, in a focusing are lamp, of the upper carbon carrying rod D, the cord M, a drum 1%, upon which said cord is wound, a spring T, connected at one end to the drum or its shaft, and an adjusting device V, attached to the opposite end of the spring.

8. The combination, substantially as described, in a focusing arc lamp, of an upper carbon carrying rod or bar connected to the feed mechanism, a cord attached at one end to said bar and at the other wound upon a suitable drum, a coiled spring attached at one end to the drum or its shaft, a spring l/V, attached to the other end, and an adjusting screw and nut, as and for the purpose described.

9. In a focusing arc lamp, the combination, substantially as described, of a carbon rod or carrier connected with the feed mechanism of the lamp, a cord M, a drum R, attached to a shaft mounted in suitable brackets 01' supports attached to the frame of the lamp, a spring T, Wound upon the same shaft, and an adjusting screw and nut V, for adjusting the tension of said spring.

Signed at New York, in the county of New York and State of New York, this 17th day of August, A. D. 1891.

LOUIS HILLS.

Witnesses:

WM. H. CAPEL, HUGO KOELKER. 

